Illuminated target



July s, m4;

W. J. BARRETT ILLUMINATED TARGET Filed Nov. 14.

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llllllll Patented July 8, 1924.

WILLIAM J'. BARRETT, OF BRIDGEPORT, CONNECTICUT. i

mummli'rnn TARGET.

Application inea mivember I4, 192s. serial uacvegm.

i and has for an object to provide an improved target which, may vloeused -in poor lights orv even in darkness. It is also an ob'ect of the.invention provide a device o `this character which y1s very simple inconstruction and to which the Ordina electric Hash lam may be easilyattache anddetached for illuminating thec jt'arget.-

' With the foregoing and other obJects 1n 2o View, I have devised theconstruction illustrated ,in the ac :cor'np'anying drawing, forming apart 'o5 this speclcation, simllar reference characters being employedthroughout the various "igures to `indicate corresponding elements. Inthisdrawing,

Fig. 1 is av side elevation of a portion of a levelers rod and myimproved target appliedthereto a portion of the front wall of the tar etbeing broken away to more clearly s ow the construction.

Fig. 2 isa similar `View of af portion of a target showing a-slightlydiierent means `for securing the flash lamp to the target, and

. lFig.- 3 is a transversesection substantially .on line 3 3' of-Fig. 1.e In this drawing 10 representsaportion of any desired type `of levelersrod graduated in the usual manner, as shown at 11.1 Mounted nto slideAonthis rod is a target 12 upon which the leveler trains his instrumentfor reading the levels in the usual manner. This tar` et has in thefront wall thereof a rectangu ar opening 13 through which thegraduations 11 are visible and is also pro- '45 vided with the usualhorizontal zero line '14.

Theusual clamping screw 15 is rovided for ,clamping the target to the roiii any desired position.

In using these instruments in poor lights as incellars, on dark days orin mines, 1t is often ve diicult for the man operating the instr `ent'to see the target and to train this instrunent on the tar et.4 -Toovercome formed a levelers rods',

provide in the front wall of this target a cross 17. .This cross ispreferably formed by cutting away the front walls ofthe charn-v ber andplacing back of the opening thus iece of glass 19- to prevent entranceof irt to the chamber. The glass I may be secured in the chamber by anysuitable means, such as guides 19. The hori- 'zontal arms 20 are on thezero line 14 and preferably extend -equal amounts on opposite sldes ofth1s line to assist in easily bringing this line into'alignment with thehorizontal hair ofthe level.v The opposite ends of these arms aretapered, as showni at 21, and fend in a small narrow slot r22 on theline. To assist inmore roperly positionling the rod-I prefer to a soprovide verti cal arms 23 at right angles to the horizontal line andsimilar -to these arms.

In order that this' cross `may be easily tvisible'in poor lights Iprovide means for l illuminatin it fromvthe interior f the chamber. Ipre er touse for this purpose an ordinary electric iash'lamp indicatedat 24. In the lower walls of the chamber is fan opening forA insertionof the light end of the lamp so thatthe light rays romthe lam areprojected into the chamber thoroug y illuminatin the cross, and means isprovided for detac ably securing this lamp to the target so that itmaybeeasily applied and-'removed as desired. In Fig. 1 I have shownspringclips 25 on l opposite sides of the lamp provided with oil'sets 26adapted ltoengage between the grooves `formed by the threads 27 on thecap of the lamp 'so that the lamp ma be secured in position by merelyforcing 1n the light end thereof to the position shownv in Fig.

1', and it maybe vremoved by merely pull- 95 i ing vit downwardly. InF1g.'2^ I have shown a Ithreaded sleeve A28 surrounding theopening in'the chamber to engage the threaded end of the casing of the lamp sothatstheclamp may be easily screwedv into 1004 position or unscrewedthere-from. To insure proper illumination of the cross I. prefer 'toprovide a curved reiector 2 9 in` the v `back wall of th'e chamber, andthe innersurface of this reflector will pref-'105 erably be paintedadull-white. This relector. ishowever,\not -necessary as the innersurface of the rear wall 30 ma be this dilicultyIhave provi ed thetarget with' painted a dull white if' preferred. hese 5g' a chamber 16on one sideof the lrod and .light surfaces being illuminated by the lampthe cross is clearly visible through the lens of the level. By havingthe arms of the cross extend ori-opposite sides of the zero line thehorizontal hair of the level is clearly visible extending longitudinallyof the horizontal arms of the cross as the light is on both sides of thehair, and it is very easy to determine when the target is in position tobring the horizontal line 14 over the hair of the instrument. TheVertical arms of the cross clearly show the vertical hair of theinstrument in the same way, indicating whether the rod is heldvertically. It is not necessary that the' glass covering the cross beclear as it may be ground glass,

- which will clearly show the threads of the instrument if illuminatedfrom the rear.

This device is clearly visible in all kinds of lights. The electriclight may be easily applied or removed, and it is safe to use 1n alllocations such as mines where there mighty be dangerof an explosion fromgas should an open light be used.

Having thus set forth the nature of my invention, what I claim is:

1. A 'target adapted to slide on a 'graduated rod provided with achamber at one side of said rod, a transparent cross in the front wallof said chamber having vertical and horizontal arms, and means forilluminating said cross.

2. A target for a levelers rod providedv on the front wall thereof witha cross having vertical and horizontal arms, and means for illumintingsaid arms.

3. A target for a levelers rod provided on the front wall thereof with-a cross having vertical and horizontal arms, said horizontal arms beingtapered at the ends thereof wlth narrow slots leading from the ends ofthe tapers.

4. A target for a levelers rodv having a chamber, a cross in the frontwall of said chamber having vertical and horizontal arms, said crossbeing adapted for trans mission of light, and means within the chamberfor illuminating the cross.

5. A target for a levelers rod having al chamber, said target having ahorizontal zero line on the face of the front wall thereof a relativelynarrow horizontal window in said front wall adapted for transmission oflight and extending on both sides of said line, the ends of saidwindowftapering toward'said line, and means in the chamber forilluminating thewindow.

6. A target for a levelers rod adapted for sliding adjustment on saidrod and. provided with a chamber at one side thereof, a trans- -parentcross in the front wall thereof having extending on opposite. sides ofsaid line and' provided with narrow slots in the ends of the arms inalignment with said line, said cross being adapted for transmission ofli means in said chamber for illuminating said cross.

8. A target for a levelers rod adapted for sliding adjustment on saidrod and provided with a chamber at one side thereof, said chamber beingprovided in the front wall thereof with a cross adapted for transmissionof light and having horizontal arms on the zero line of the target, anelectric. flash light for illuminatingv said cross, and means fordetachably mounting said light in said target.

.9. A target for a levelers rod adapted for sliding adjustment on saidrod :and provided with a chamber at one side thereof, said chamber beingprovided in the front wall thereof with a cross adapted for transmissionof light and having .horizontal arms on the zero line of the target, thelower wall of said chamber being 'provided with an opening adapted forinsertion of the light end of an electric flash lamp, and means` fordetachably securing an electric flash lamp in said opening to illuminatesaid cross.

`10. A target lfor a levelers rod adapted t, and t forv slidingadjustment on said-rod and provided with a chamber at one side thereof,said chamber being provided in the front wall thereof with a crossadapted for transmission of li ht and having horizontal arms on the zeroline of the targetand extending on opposite sides thereof, said armsbeing provided at their ends with narrow slots on said line, and means'for detachably connecting an electric flash lamp to said target toproject its light into said chamber and illuminate said cros's. v

In testimony whereof I aiiix my signature;

WILLIAM J. BARRETT/

